Witnesses not seeing him doesn't mean he didn't use the stairway.
"The finger prints were added later, false evidence reported by a witness in the morgue. Of course he was working there, that was his ‘Intel’ orders to stay put until his next assignment."
There is no evidence fingerprints were added later. You admit he was working there. The issue was you said he couldn't be placed there. Now you are throwing out other things. There's no evidence he had any "Intel orders" to do anything. Just because people can dream these things up doesn't mean they happened.
"The change in the story made it more believable that Oswald could have rushed to where he was found."
No.
Would not stand up in court, and very unlikely he did use the stairs as it was a short period of time he had to use them. And the people using them didn’t see anyone.
***Witnesses not seeing him doesn’t mean he didn’t use the stairway.***
After the officials visited Oswald in the morgue he had ink on his body, not disputed. The Official story would not hold up in court.
***There is no evidence fingerprints were added later.***
Your behind on your research, there is plenty. There is more known about Oswald in the year 2009 than JFK or anyone else involved. More has come out on Oswald recently, one example being the 700+ page book written by his mistress who spent most of her time with him in New Orleans in 63. She was privy to his ‘Intel’ assignments in detail. People just don’t realize what info is out there, suggest search keywords on Amazon. There is weeks worth of reading available to anyone interested.
***There’s no evidence he had any “Intel orders” to do anything.***